The results from part C of the questionnaireconcerning perceptions about collaboration had thehighest average score (4.43). This can indicate thatstudents regard PBL as having positive effects onimproving their collaborative learning and working. Thefindings also corroborate with Srikrai (2008) which pointed out that the participants of the project learn towork cooperatively with their classmates. However, thedata from student’s interview doesn’t explain much onwhat manner PBL improve their collaborative skills.